Since I am regularly using certain tool combinations like "pen; 0,5 mm; black", and "pen; 0,8 mm; violet" and many others, I would appreciate some kind of "one touch customizable tool kit" where I can save my regularly used settings for tools, and access them with only one touch.
It is like the pencil case you used in school, except you can freely create your own tools the way and in the combination you need them.
Other (for me less likeable but still) way to implement this kind of feature: an automatic list of recently or mostly used tools / tool combinations.

This would make working on notes much faster and easier (and sometimes less bothersome, even though Papyrus is a great app), and also more creative in a certain way.

Would be much appreciated to have not only arrows but also a whole symbol kit! Arrows in different sizes and styles, big dots and squares for lists and a big set of sizable emoji, as well as popular symbols often used in the media that aren't already part the emoji.

Also straight lines with different preset angles (0°, 45°, 90°) would be pretty useful.

Since we are talking about note organization, I suggest to also implement the possibility to place bookmarks / chapters into the notes. These bookmarks should also be selectable in the PDF exports of the notes (same as in PDF exported Word or LibreOffice Write documents). This way the user can jump between several points in the same note.
This idea may be extended into a more complex feature, which would allow to use the bookmarks also as tags for several notes. Example: I use the bookmark "method" in several documents, so the (potential) tag manager of Papyrus could tell me which of my notes has the bookmark "method" and can directly jump to the respective passages selected between all my notes.

OK, this sounds like pretty much, but I hope that there are or this gives some useful ideas...

I think it would be fine to have an option where the user may choose which information he/she wants to have in the header or footer: notebook name, note name, date created, date last modified, page number, total page number, name of the note creator...

Thank you all for your wonderful feedback! I just wanted to set a few things straight.

First, in-app purchases are tied to your Google or Samsung account, depending on which store you downloaded Papyrus from. Purchases are automatically restored or enabled by Google Play or Samsung Apps on all devices you are signed into with that account. This means, if you get a new device, have multiple devices, or need to reinstall Papyrus, you only need to purchase the premium features once (as long as you use the same account). This is true for all applications in these stores (not just Papyrus) as it is handled by Google and Samsung. Please note, however, that it can sometimes take a little while for purchases to show up on other devices or after just installing Papyrus (usually it’s instant though).

Second, we’re always trying to figure out the best business model for us and our users so we can continue to make Papyrus the best note-taking app. We currently offer different paid features individually so users can choose what they want, rather than having one higher priced option (such as a “pro” version or single in-app purchase). Each feature we add to Papyrus is not a new paid feature. In fact, we’ve added many features to the free version of Papyrus over the past year, and we will continue to do so.

Please feel free to continue to provide constructive feedback here about pricing models and what you would like to see!

Thank you all for your wonderful feedback! I just wanted to set a few things straight.

First, in-app purchases are tied to your Google or Samsung account, depending on which store you downloaded Papyrus from. Purchases are automatically restored or enabled by Google Play or Samsung Apps on all devices you are signed into with that account. This means, if you get a new device, have multiple devices, or need to reinstall Papyrus, you only need to purchase the premium features once (as long as you use the same account). This is true for all applications in these stores (not just Papyrus) as it is handled by Google and Samsung. Please note, however, that it can sometimes take a little while for purchases to show up on other devices or after just installing Papyrus (usually it’s instant though).

Second, we’re always trying to figure out the best business model for…

- Pro version has all features and is a bit less expensive than buying all features altogether.

- With the free version the user can pick the paid features he's interested in. Would be nice if the user can upgraded to pro through in-app buy with a discounted price, in case he already has bought some some paid features. (discounted means that in total it comes to the normal pro price in the end, obviously)

I think it is the most user friendly model in the end, and suits, on the other hand, the developers' pricing model with the in-app buys.